deesset
deesset is a Latin form of desum, meaning “be lacking, fail (+dat.)”. It is the 3rd person singular imperfect active subjunctive.
Found 70 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.48.3: Ex eo die dies continuos V Caesar pro castris suas copias produxit et aciem instructam habuit, ut, si vellet Ariovistus proelio contendere, ei potestas non deesset.
All forms of desum (conjugation table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.